SteelStainlesssteelCast ironNon-ferrousmaterial BTA DRILLS BRAZED GRADES COMBINATION per ISO APPLICATION 10 20 30 40 50 TB253 TB103 TB203 TB253 TB293 TB293 TT5100 APPLICATION OF GRADE COMBINATIONS Machine & working conditions Poor Medium Good TB253 Recommended Grade TB203 TB103 ITEMIZED GRADE COMBINATIONS Item Standard Grade Semi-standard Grade Special Grade BTA TB253 TB103 TB203 TB293 BTS TB203 All listed grades are coated with TiAN. TiN-coatings are available on request. 640